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however i want to make sure if i should really buy this or not, because i don't really know much about roller, does the drum still look good? how should i know if the roller is still good? what should i check?

Looks like a good buy. Main concern would be the belt and how
easy it would be to replace. Likely a polyurethane round solid
plastic with ends thermofused. A standard industrial item somewhat
mysterious to those outside the loop. Secondary would be the roller
bearings, but likely these are also standard sealed bearings and
would have a very long life if they haven't dried out. Neither item
is a major problem. Real problem is personal: would you use them?
Rollers are an acquired taste. If you like to work out at health
clubs or do spinning classes then they would be a good addition
to your training regimen for those rainy days of winter.